It's summertime on the lovely isle of Sodor and everyone should be having a good time working and playing hard. But it seems that the Steam engines and the Diesels just can't get along and therefore no work is being done at all! Meanwhile there's a bridge that needs building and airport to erect and lots of materials to haul. Can Thomas and his engine friends save the day resolve their differences with the Diesels and get all the work done in time? Find out in this charming episode of the popular children's TV show based on the books created in 1945 by Reverend Wilbert Vere Awdry.